A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 1, GRISWOLD, IA 51535-0001
PO BOX 2, GRISWOLD, IA 51535-0002
PO BOX 3, GRISWOLD, IA 51535-0003
PO BOX 4, GRISWOLD, IA 51535-0004
PO BOX 5, GRISWOLD, IA 51535-0005
PO BOX 6, GRISWOLD, IA 51535-0006
PO BOX 7, GRISWOLD, IA 51535-0007
PO BOX 8, GRISWOLD, IA 51535-0008
PO BOX 9, GRISWOLD, IA 51535-0009
PO BOX 10, GRISWOLD, IA 51535-0010
PO BOX 11, GRISWOLD, IA 51535-0011
PO BOX 12, GRISWOLD, IA 51535-0012
PO BOX 13, GRISWOLD, IA 51535-0013
PO BOX 14, GRISWOLD, IA 51535-0014
PO BOX 15, GRISWOLD, IA 51535-0015
PO BOX 16, GRISWOLD, IA 51535-0016
PO BOX 17, GRISWOLD, IA 51535-0017
PO BOX 18, GRISWOLD, IA 51535-0018
PO BOX 19, GRISWOLD, IA 51535-0019
PO BOX 20, GRISWOLD, IA 51535-0020
PO BOX 21, GRISWOLD, IA 51535-0021
PO BOX 22, GRISWOLD, IA 51535-0022
PO BOX 23, GRISWOLD, IA 51535-0023
PO BOX 24, GRISWOLD, IA 51535-0024
PO BOX 25, GRISWOLD, IA 51535-0025
PO BOX 26, GRISWOLD, IA 51535-0026
PO BOX 27, GRISWOLD, IA 51535-0027
PO BOX 28, GRISWOLD, IA 51535-0028
PO BOX 29, GRISWOLD, IA 51535-0029
PO BOX 30, GRISWOLD, IA 51535-0030
PO BOX 31, GRISWOLD, IA 51535-0031
PO BOX 32, GRISWOLD, IA 51535-0032
PO BOX 33, GRISWOLD, IA 51535-0033
PO BOX 34, GRISWOLD, IA 51535-0034
PO BOX 35, GRISWOLD, IA 51535-0035
PO BOX 36, GRISWOLD, IA 51535-0036
PO BOX 37, GRISWOLD, IA 51535-0037
PO BOX 38, GRISWOLD, IA 51535-0038
PO BOX 39, GRISWOLD, IA 51535-0039
PO BOX 40, GRISWOLD, IA 51535-0040
PO BOX 41, GRISWOLD, IA 51535-0041
PO BOX 42, GRISWOLD, IA 51535-0042
PO BOX 43, GRISWOLD, IA 51535-0043
PO BOX 44, GRISWOLD, IA 51535-0044
PO BOX 45, GRISWOLD, IA 51535-0045
PO BOX 46, GRISWOLD, IA 51535-0046
PO BOX 47, GRISWOLD, IA 51535-0047
PO BOX 48, GRISWOLD, IA 51535-0048
PO BOX 49, GRISWOLD, IA 51535-0049
PO BOX 50, GRISWOLD, IA 51535-0050
PO BOX 51, GRISWOLD, IA 51535-0051
PO BOX 52, GRISWOLD, IA 51535-0052
PO BOX 53, GRISWOLD, IA 51535-0053
PO BOX 54, GRISWOLD, IA 51535-0054
PO BOX 55, GRISWOLD, IA 51535-0055
PO BOX 56, GRISWOLD, IA 51535-0056
PO BOX 57, GRISWOLD, IA 51535-0057
PO BOX 58, GRISWOLD, IA 51535-0058
PO BOX 59, GRISWOLD, IA 51535-0059
PO BOX 60, GRISWOLD, IA 51535-0060
PO BOX 61, GRISWOLD, IA 51535-0061
PO BOX 62, GRISWOLD, IA 51535-0062
PO BOX 63, GRISWOLD, IA 51535-0063
PO BOX 64, GRISWOLD, IA 51535-0064
PO BOX 65, GRISWOLD, IA 51535-0065
PO BOX 66, GRISWOLD, IA 51535-0066
PO BOX 67, GRISWOLD, IA 51535-0067
PO BOX 68, GRISWOLD, IA 51535-0068
PO BOX 69, GRISWOLD, IA 51535-0069
PO BOX 70, GRISWOLD, IA 51535-0070
PO BOX 71, GRISWOLD, IA 51535-0071
PO BOX 72, GRISWOLD, IA 51535-0072
PO BOX 73, GRISWOLD, IA 51535-0073
PO BOX 74, GRISWOLD, IA 51535-0074
PO BOX 75, GRISWOLD, IA 51535-0075
PO BOX 76, GRISWOLD, IA 51535-0076
PO BOX 77, GRISWOLD, IA 51535-0077
PO BOX 78, GRISWOLD, IA 51535-0078
PO BOX 79, GRISWOLD, IA 51535-0079
PO BOX 80, GRISWOLD, IA 51535-0080
PO BOX 81, GRISWOLD, IA 51535-0081
PO BOX 82, GRISWOLD, IA 51535-0082
PO BOX 83, GRISWOLD, IA 51535-0083
PO BOX 84, GRISWOLD, IA 51535-0084
PO BOX 85, GRISWOLD, IA 51535-0085
PO BOX 86, GRISWOLD, IA 51535-0086
PO BOX 87, GRISWOLD, IA 51535-0087
PO BOX 88, GRISWOLD, IA 51535-0088
PO BOX 89, GRISWOLD, IA 51535-0089
PO BOX 90, GRISWOLD, IA 51535-0090
PO BOX 91, GRISWOLD, IA 51535-0091
PO BOX 92, GRISWOLD, IA 51535-0092
PO BOX 93, GRISWOLD, IA 51535-0093
PO BOX 94, GRISWOLD, IA 51535-0094
PO BOX 95, GRISWOLD, IA 51535-0095
PO BOX 96, GRISWOLD, IA 51535-0096
PO BOX 97, GRISWOLD, IA 51535-0097
PO BOX 98, GRISWOLD, IA 51535-0098
PO BOX 99, GRISWOLD, IA 51535-0099
PO BOX 100, GRISWOLD, IA 51535-0100
PO BOX 101, GRISWOLD, IA 51535-0101
PO BOX 102, GRISWOLD, IA 51535-0102
PO BOX 103, GRISWOLD, IA 51535-0103
PO BOX 104, GRISWOLD, IA 51535-0104
PO BOX 105, GRISWOLD, IA 51535-0105
PO BOX 106, GRISWOLD, IA 51535-0106
PO BOX 107, GRISWOLD, IA 51535-0107
PO BOX 108, GRISWOLD, IA 51535-0108
PO BOX 109, GRISWOLD, IA 51535-0109
PO BOX 110, GRISWOLD, IA 51535-0110
PO BOX 111, GRISWOLD, IA 51535-0111
PO BOX 112, GRISWOLD, IA 51535-0112
PO BOX 113, GRISWOLD, IA 51535-0113
PO BOX 114, GRISWOLD, IA 51535-0114
PO BOX 115, GRISWOLD, IA 51535-0115
PO BOX 116, GRISWOLD, IA 51535-0116
PO BOX 117, GRISWOLD, IA 51535-0117
PO BOX 118, GRISWOLD, IA 51535-0118
PO BOX 119, GRISWOLD, IA 51535-0119
PO BOX 120, GRISWOLD, IA 51535-0120
PO BOX 121, GRISWOLD, IA 51535-0121
PO BOX 122, GRISWOLD, IA 51535-0122
PO BOX 123, GRISWOLD, IA 51535-0123
PO BOX 124, GRISWOLD, IA 51535-0124
PO BOX 125, GRISWOLD, IA 51535-0125
PO BOX 126, GRISWOLD, IA 51535-0126
PO BOX 127, GRISWOLD, IA 51535-0127
PO BOX 128, GRISWOLD, IA 51535-0128
PO BOX 129, GRISWOLD, IA 51535-0129
PO BOX 130, GRISWOLD, IA 51535-0130
PO BOX 131, GRISWOLD, IA 51535-0131
PO BOX 132, GRISWOLD, IA 51535-0132
PO BOX 133, GRISWOLD, IA 51535-0133
PO BOX 134, GRISWOLD, IA 51535-0134
PO BOX 135, GRISWOLD, IA 51535-0135
PO BOX 136, GRISWOLD, IA 51535-0136
PO BOX 137, GRISWOLD, IA 51535-0137
PO BOX 138, GRISWOLD, IA 51535-0138
PO BOX 139, GRISWOLD, IA 51535-0139
PO BOX 140, GRISWOLD, IA 51535-0140
PO BOX 141, GRISWOLD, IA 51535-0141
PO BOX 142, GRISWOLD, IA 51535-0142
PO BOX 143, GRISWOLD, IA 51535-0143
PO BOX 144, GRISWOLD, IA 51535-0144
PO BOX 145, GRISWOLD, IA 51535-0145
PO BOX 146, GRISWOLD, IA 51535-0146
PO BOX 147, GRISWOLD, IA 51535-0147
PO BOX 148, GRISWOLD, IA 51535-0148
PO BOX 149, GRISWOLD, IA 51535-0149
PO BOX 150, GRISWOLD, IA 51535-0150
PO BOX 151, GRISWOLD, IA 51535-0151
PO BOX 152, GRISWOLD, IA 51535-0152
PO BOX 153, GRISWOLD, IA 51535-0153
PO BOX 154, GRISWOLD, IA 51535-0154
PO BOX 155, GRISWOLD, IA 51535-0155
PO BOX 156, GRISWOLD, IA 51535-0156
PO BOX 157, GRISWOLD, IA 51535-0157
PO BOX 158, GRISWOLD, IA 51535-0158
PO BOX 159, GRISWOLD, IA 51535-0159
PO BOX 160, GRISWOLD, IA 51535-0160
PO BOX 161, GRISWOLD, IA 51535-0161
PO BOX 162, GRISWOLD, IA 51535-0162
PO BOX 163, GRISWOLD, IA 51535-0163
PO BOX 164, GRISWOLD, IA 51535-0164
PO BOX 165, GRISWOLD, IA 51535-0165
PO BOX 166, GRISWOLD, IA 51535-0166
PO BOX 167, GRISWOLD, IA 51535-0167
PO BOX 168, GRISWOLD, IA 51535-0168
PO BOX 169, GRISWOLD, IA 51535-0169
PO BOX 170, GRISWOLD, IA 51535-0170
PO BOX 171, GRISWOLD, IA 51535-0171
PO BOX 172, GRISWOLD, IA 51535-0172
PO BOX 173, GRISWOLD, IA 51535-0173
PO BOX 174, GRISWOLD, IA 51535-0174
PO BOX 175, GRISWOLD, IA 51535-0175
PO BOX 176, GRISWOLD, IA 51535-0176
PO BOX 177, GRISWOLD, IA 51535-0177
PO BOX 178, GRISWOLD, IA 51535-0178
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